<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document的属性</title>
</head>
<body>
    <div id="app">
        hello
        <a href="#">百度</a>
    </div>
</body>
<script>
    // console.log(Document)

    var d = document.getElementById("app");

    // console.log(document.documentElement);     //始终指向HTML页面中的<html>元素

    console.log(document.links);
</script>
</html>